Update cheetah SVN to 50
Bug: 313797924 (cherry picked from https://googleplex-android-review.googlesource.com/q/commit:5d3f52f5d303a241ec44a2a401aa64f100c93b6d) Merged-In: I92cd332e8402285c3c04115336f4b48825b86892 Change-Id: I92cd332e8402285c3c04115336f4b48825b86892